fix: allow demo even without midi

README.md

@@ -18,7 +18,7 @@ TODO cool image and youtube link
   - [From release](#from-release)
   - [From repository (PKGBUILD)](#from-repository-pkgbuild)
   - [From repository (dev version)](#from-repository-dev-version)
-- [Usage](#usage)
+- [CLI usage](#cli-usage)
 - [Default Shaders and Config](#default-shaders-and-config)
   - [Sources and Effects](#sources-and-effects)
   - [Debug View](#debug-view)
@@ -81,7 +81,7 @@ make
 make install
 ```
 
-## Usage
+## CLI usage
 
 ```txt
 usage: forge [-h] [-v] [-hr] [-s=SCREEN] [-m=SCREEN] [-mo] [-f=DIR_PATH] [-c=CFG_PATH] [-sf=STATE_PATH] [-ls / -nls] [-ss / -nss] [-is=SIZE] [-v=FILE] [-vs=SIZE] [-t=TEMPO] [--demo] [-w] 

src/forge.c

@@ -265,10 +265,10 @@ void forge_run(Parameters params) {
     if (!midi_background_listen(midi, context, midi_callback)) {
       return;
     }
+  }
 
-    if (!state_background_midi_write(context, state_config, midi)) {
-      return;
-    }
+  if (!state_background_write(context, state_config, midi)) {
+    return;
   }
 
   window_startup(error_callback);

src/state.c

@@ -272,8 +272,8 @@ void state_apply_event(SharedContext *context, StateConfig state_config,
   }
 }
 
-bool state_background_midi_write(SharedContext *context,
-                                 StateConfig state_config, MidiDevice midi) {
+bool state_background_write(SharedContext *context, StateConfig state_config,
+                            MidiDevice midi) {
   pid_t pid;
   bool beat_active, last_active, change, last_change;
 
@@ -287,9 +287,11 @@ bool state_background_midi_write(SharedContext *context,
   }
   log_info("(state) background writing started (pid: %d)", pid);
 
-  update_page(context, state_config, midi);
-  update_active(context, state_config, midi);
-  update_values(context, state_config, midi);
+  if (!midi.error) {
+    update_page(context, state_config, midi);
+    update_active(context, state_config, midi);
+    update_values(context, state_config, midi);
+  }
 
   last_active = false;
   last_change = false;
@@ -297,20 +299,20 @@ bool state_background_midi_write(SharedContext *context,
   while (!context->stop) {
     beat_active = tempo_progress(context->tempo, 1.0) < 0.25;
 
-    if (beat_active != last_active) {
+    if (!midi.error && beat_active != last_active) {
       safe_midi_write(midi, state_config.tap_tempo_code,
                       beat_active ? MIDI_MAX : 0);
 
       safe_midi_write(midi,
                       state_config.select_frag_codes.values[context->selected],
                       beat_active ? MIDI_MAX : 0);
-
-      last_active = beat_active;
     }
 
+    last_active = beat_active;
+
     change = tempo_progress(context->tempo, 4.0) < 0.25;
 
-    if (change && !last_change && context->demo) {
+    if (context->demo && change && !last_change) {
       state_randomize(context, state_config);
     }
 

src/state.h

@@ -9,8 +9,8 @@ void state_apply_event(SharedContext *context, StateConfig state_config,
                        MidiDevice midi, unsigned char code, unsigned char value,
                        bool trace_midi);
 
-bool state_background_midi_write(SharedContext *context,
-                                 StateConfig state_config, MidiDevice midi);
+bool state_background_write(SharedContext *context, StateConfig state_config,
+                            MidiDevice midi);
 
 void state_init(SharedContext *context, StateConfig state_config, bool demo,
                 unsigned int base_tempo, char *state_file, bool load_state);